One Life

 "If it saves only one life."

This phrase is beloved by the ASPL when it comes to "common sense" legislation.   The implication is that we should happily accede to restrictions or diminishments of our constitutionally guaranteed right to bear arms,  as long as it might save one life.  

If this phrase is True, if it represents an objective standard based in Truth, then this phrase should/would apply equally to any situation.   If saving one life is the standard by which public policy and rights are judged, then wouldn't we apply this standard to any and every public policy debate?   

Yet we don't do we?   Some debates or policies are exempt from being judged by this standard.   I can't help but wonder why.